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Title: Photoionization of tungsten ions: experiment and theory for $${{\rm{W}}}^{2+}$$ and $${{\rm{W}}}^{3+}$$

Abstract

Experimental and theoretical results are reported for single-photon single ionization of W2+ and W3+ tungsten ions. Experiments were performed at the photon-ion merged-beam setup of the Advanced Light Source in Berkeley. Absolute cross sections and detailed energy scans were measured over an energy range 20-90 eV at a bandwidth of 100 meV. Broad peak features with widths typically around 5 eV have been observed with almost no narrow resonances present in the investigated energy range. Theoretical results were obtained from a Dirac-Coulomb R-matrix approach. The calculations were carried out for the lowest-energy terms of the investigated tungsten ions with levels 5s25p65d4 5DJ J = 0, 1, 2, 3, 4 for W2+ and 5s25p65d3 4FJ' J' = 3/2, 5/2, 7/2, 9/2 for W3+. Assuming a statistically weighted distribution of ions in the initial ground-term levels there is good agreement of theory and experiment for W 3+ ions. However, for W2+ ions at higher energies there is a factor of approximately two difference between experimental and theoretical cross sections.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1398396
DOE Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Journal of Physics. B, Atomic, Molecular and Optical Physics
Additional Journal Information:
Journal Volume: 49; Journal Issue: 6; Journal ID: ISSN 0953-4075
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

McLaughlin, B. M., Ballance, C. P., Schippers, S., Hellhund, J., Kilcoyne, A. L. D., Phaneuf, R. A., and Müller, A. Photoionization of tungsten ions: experiment and theory for ${{\rm{W}}}^{2+}$ and ${{\rm{W}}}^{3+}$. United States: N. p., 2016. Web. doi:10.1088/0953-4075/49/6/065201.
McLaughlin, B. M., Ballance, C. P., Schippers, S., Hellhund, J., Kilcoyne, A. L. D., Phaneuf, R. A., & Müller, A. Photoionization of tungsten ions: experiment and theory for ${{\rm{W}}}^{2+}$ and ${{\rm{W}}}^{3+}$. United States. https://doi.org/10.1088/0953-4075/49/6/065201
McLaughlin, B. M., Ballance, C. P., Schippers, S., Hellhund, J., Kilcoyne, A. L. D., Phaneuf, R. A., and Müller, A. 2016. "Photoionization of tungsten ions: experiment and theory for ${{\rm{W}}}^{2+}$ and ${{\rm{W}}}^{3+}$". United States. https://doi.org/10.1088/0953-4075/49/6/065201.
@article{osti_1398396,
title = {Photoionization of tungsten ions: experiment and theory for ${{\rm{W}}}^{2+}$ and ${{\rm{W}}}^{3+}$},
author = {McLaughlin, B. M. and Ballance, C. P. and Schippers, S. and Hellhund, J. and Kilcoyne, A. L. D. and Phaneuf, R. A. and Müller, A.},
abstractNote = {Experimental and theoretical results are reported for single-photon single ionization of W2+ and W3+ tungsten ions. Experiments were performed at the photon-ion merged-beam setup of the Advanced Light Source in Berkeley. Absolute cross sections and detailed energy scans were measured over an energy range 20-90 eV at a bandwidth of 100 meV. Broad peak features with widths typically around 5 eV have been observed with almost no narrow resonances present in the investigated energy range. Theoretical results were obtained from a Dirac-Coulomb R-matrix approach. The calculations were carried out for the lowest-energy terms of the investigated tungsten ions with levels 5s25p65d4 5DJ J = 0, 1, 2, 3, 4 for W2+ and 5s25p65d3 4FJ' J' = 3/2, 5/2, 7/2, 9/2 for W3+. Assuming a statistically weighted distribution of ions in the initial ground-term levels there is good agreement of theory and experiment for W 3+ ions. However, for W2+ ions at higher energies there is a factor of approximately two difference between experimental and theoretical cross sections.},
doi = {10.1088/0953-4075/49/6/065201},
url = {https://www.osti.gov/biblio/1398396}, journal = {Journal of Physics. B, Atomic, Molecular and Optical Physics},
issn = {0953-4075},
number = 6,
volume = 49,
place = {United States},
year = {2016},
month = {2}
}

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